I don't understand why people think that tbh. Can you explain this to me if you don't mind?
He wasted his potential to make his perfect ideas work by doing his shootings anyways. He had high iq ideas he should have publicly promoted.
I don't really think we should sympathize with the attention seeking foids at leddit. But his roommates wanted him kicked out of the apartment because they thought he was weird and disliked him. One of them actually complained to try and get him kicked out. Not that ER should have killed them for that. He should have instead confronted them and told them they were idiots and would not be as cool as he was. Because Elliot did have coolness tbh.
Not only did ER never try to kill his stepbrother, he actually saved his life once when he nearly drowned in a swimming pool. His sister should be grateful to him. Sure, he fantasized about killing him to take revenge on his stepmother, but never went along with it.